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Peter Alem, Paul A. Thomas, and Marc W. van Iersel

application rates. The objectives of this experiment were to: 1) quantify the interactive effects of CRF rate and θ on the growth of petunia; 2) determine the optimum θ and CRF rate for the production of high-quality plants without leaching, and 3) to quantify

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Paul R. Fisher, William R. Argo, and John A. Biernbaum

.5 with Zinnia hybrida Roem. & Usteri (zinnia) under the same conditions. In greenhouse experiments, Argo and Biernbaum (1997) found that the average substrate pH of 10 potted plant species given the same WSF [20N–4.3P–16.6K Peatlite Special (Scotts

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S. Christopher Marble, Jeff L. Sibley, Charles H. Gilliam, and H. Allen Torbert

disposal methods with respect to non-point source pollution and other environmental concerns ( Ribaudo, 2003 ). Because leached nitrate-N from landscape fertilization programs can contaminate drinking water, it is important to identify landscape

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Kathryn M. Santos, Paul R. Fisher, and William R. Argo

reduce rooting percentage ( Geneve et al., 2004 ). Improved irrigation management may help reduce nutrient, pesticide, and trace element loads in irrigation runoff to surface waters as well as leaching of agricultural chemicals into groundwater supplies

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Kimberly A. Klock-Moore and Timothy K. Broschat

Growth of hand-watered and subirrigated `Ultra Red' petunia (Petunia ×hybrida Hort.) and `Super Elfin Violet' impatiens (Impatiens wallerana Hook.f.) plants were compared when grown using four controlled-release fertilizer rates and four fertilizer placements in the pot. Furthermore, the amount of NO3-N leached from hand-watered plants was compared to amount captured by subirrigation system. Before planting, Osmocote (14N-6.2P-11.6K) (4 month release) was either topdressed (TD), layered in the middle of the pot (M), layered at the bottom of the pot (B), or incorporated throughout (I) the substrate at 1.25, 2.5, 5.0, or 7.5 kg·m-3 (oz/ft3). Shoot dry mass of petunia plants was similar between both irrigation systems and among the four fertilizer placements. Subirrigated petunias fertilized with 2.5 kg·m-3 had similar shoot dry mass as hand-watered petunias fertilized with 7.5 kg·m-3. Hand-watered impatiens had greater shoot dry mass than subirrigated impatiens. Hand-watered impatiens also had greater shoot dry mass in pots with fertilizer at TD, M, or I than with fertilizer at B, but no difference in growth was observed in subirrigated impatiens among the different fertilizer placements. Finally, significantly more NO3-N was leached from hand-watered plants than was captured with the subirrigation systems.

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Amy J. Compton and Paul V. Nelson

trade names in this publication does not imply endorsement by the NCARS of the products named or criticism of similar ones not mentioned. We gratefully acknowledge Goldsmith Seeds, Gilroy, Calif.; for providing petunia seed; Sun Gro Horticulture

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Kathryn M. Santos, Paul R. Fisher, and William R. Argo

experiments ( Table 2 ). A net loss of P was measured in Expt. 2 and could be attributed to a combination of foliar leaching. Table 2. Tissue nitrogen (N), phosphorus (P), and potassium (K) uptake of Petunia × hybrida ‘Supertunia Royal Velvet’ (Expt

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Christopher J. Currey and Roberto G. Lopez

‘Raspberry Sachet’, and Petunia ×hybrida ‘Cascadia Marshmallow Pink’ were received at Purdue University, West Lafayette, IN (lat. 40° N). Cuttings were placed in 105-cell propagation trays (28-mL individual cell volume; T.O. Plastics, Inc., Clearwater, MN

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Glenn B. Fain, Charles H. Gilliam, Jeff L. Sibley, Cheryl R. Boyer, and Anthony L. Witcher

flats (PLG288O; ITML Horticultural Products Inc.) of either marigold ( Tagetes patula ‘Hero Spry’; 4 to 5 weeks from sowing) or petunia ( Petunia × hybrida ‘Dreams Purple’ 6 to 7 weeks from sowing) were planted into each container. Containers were

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Kathryn M. Santos, Paul R. Fisher, Thomas Yeager, Eric H. Simonne, Hannah S. Carter, and William R. Argo

3 weeks. Average volume leached was 1.2 and 0.7 L per experimental unit 7 and 14 to 21 d after sticking, respectively. Table 1. Fertilization treatments applied to Petunia × hybrida over a 21-d crop cycle. z The experiment was divided into four